exam Maths Puzzle Numerical Ability

TO MAKE LOW-FAT COTTAGE, MILK CONTAINING 4%BUTTERFAT IS MIXED WITH 10 GALLONS OF MILK CONTAING 1% BUTTERFAT TO OBTAIN A MIXTURE CONTAINING 2% BUTTERFAT HOW MANY GALLONS OF THE RICH

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tutors can you help please

Solve 4^x-6=16^x

and

e^-2x=0.3

Thank you!!!!!!!!!!! Help please

1) State the domain of the following:?
a) f(x)=cuberoot (x)-8

b) h(x)=3x^2+5x-3

c) m(x)=5x^2+9

d) l(x)=5x-4

e) g(x)=7x+4x+4